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Static Var Compensation (SVC) is consists of power electronics circuits to be used with the electric power system for voltage control. SVC is considered as one of the most important and famous modules from the Flexible AC Transmission System (FACTS) devices. SVC is the economic constraints to affect the real network under variation of system operating conditions to maintain the voltage levels and to control the active and reactive power flows. The controlling system by the thyristors into the SVCs modules is more effective to provide fast-acting reactive power compensation. This paper discusses the optimum voltage control techniques using the SVC module with the transmission line to overcome the drop and the influence factors for the voltage in the power system. This paper uses the MATLAB/Simulink software to introduce the thyristors operation steps at coupling the shunt SVC module with the power system to reach the optimal compensation at the voltage drop in the power system. The simulation in this paper has been carried with IEEE-9 busbar distribution system as an example to shows the difference voltage and the power losses without and with SVC installation with the power system.

Using of un-symmetrical solid-state control loads leads to huge amount of harmonics fed to the balanced three-phase systems. Dependently, the harmonics cause many problems with un-balanced and distorted supply waveforms. In this paper, three-phase 3-wire balanced source energizes a hybrid electric-unbalanced traction system that fed from two independent rectified single-phase supplies. Both trains are fed from a balanced three-phase 3-wire supply via V/V transformer. A proposed shunt active power filter (SAPF) is introduced to mitigate most of the harmonics and rebalance the supply. Intelligent PI-controller is used with self-tuning to regulate the voltage of the DC-link for the proposed filter. This smart controller and its parameters is tuned and optimized by using intelligent technique with the particle swarm optimization (PSO). PSO is one of the most prevailing methods to solve the non-linear optimization problems. Also, the system includes a hysteresis current regulator for generating the IGBT-triggering pulses of the inverter. The proposed system is designed, simulated and implemented with the help of the Matlab/Simulink software package. The test results are obtained and compared with and without optimization technique. With optimized algorithm, the total harmonic distortion (THD) is minimized; restoring the balance of the system, and the power factor of the supply is improved to unity. However, those results demonstrate that the proposed system is robust to non-linearity and more suitable for harmonic mitigation in electric traction.

The purpose of this paper to overcome the impact of electric and magnetic fields on the Intelligent Electronic Devices (IEDs) in High Voltage (HV) substations. The protection devices are considered one from IEDs in HV substation, that's will affect by this fields, this affection will lead to induced current in the secondary connection cables and all devices, that follows to errors in the measurements and the relay decision for the trip command at the fault occurs. So, the calculation of the fault location by the protection IEDs is not accurate. This paper shows the study results of the electric and magnetic field inside HV substation 500 kV, and the result curves shows how the Electromagnetic Field (EMF) vary under HV busbar 500 kV. This study uses the mathematical calculation with MATLAB software, where, the computation domain considered was the 2D free space case study results of a busbar 500kV in outdoor substation design.